Though Mitt Romney barely eked out a win in Michigan, he spent nearly twice as much as runner-up Rick Santorum on TV and radio ads. Justin Sullivan/Getty Images

March 1, 2012

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Mitt Romney squeaked through Michigan's GOP presidential primary this week with a narrow, three-percent win over Rick Santorum. And the allocation of the state's 30 delegates was even tighter — both candidates emerged with 15, leading Santorum's camp to call the race a tie. But the campaign spending race wasn't even close, with Romney, once again, outspending his rivals by a mile. Here, a look at the Republican frontrunner's "huge" financial edge, by the numbers:

$4.3 millionAmount Romney and his super PAC, Restore Our Future, spent on TV and radio ads in Michigan. About $2.3 million of that went to TV ads paid for by Restore Our Future.

$2.3 millionAmount Santorum and his backers spent in the state. Most of the total — $1.3 million — came from the pro-Santorum super PAC, Red White and Blue Fund.